题目内容
计算:
(1)-8
+
(保留三个有效数字,
≈1.732,
≈1.414);
(2)2
+
-10
(精确到0.01,
≈1.732,
≈2.236).
(1)-8
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
(2)2
| 3 |
| ||
| 2 |
| 0.04 |
| 3 |
| 5 |
(1)原式=-8×1.732+
×1.414
≈-13.856+
≈-13.868+0.942
≈-12.9;
(2)原式=2×1.732+
-10×
≈3.464+1.123-2
≈2.58.
| 2 |
| 3 |
≈-13.856+
| 2.828 |
| 3 |
≈-13.868+0.942
≈-12.9;
(2)原式=2×1.732+
| 2.246 |
| 2 |
| 1 |
| 5 |
≈3.464+1.123-2
≈2.58.
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